Fig. 3

Minute by minute temperature recordings during patient transport. Patient compartment temperatures, minute by minute, in the HEMS during winter (a), and spring (b), and in one ground ambulance during summer (c). The three graphs are selected to illustrate the main temperature trends between different vehicles and seasons. The complete data for all three ambulance vehicles and four seasons is submitted as Additional data file. The asterisk denotes that the graph was truncated at 180 min for this individual mission. The temperature remained essentially unchanged until the end of the mission at 256 min. HEMS: helicopter emergency medical service